From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: impact of 4k sector size on the IO & FS stack Date: Mon, 12 Mar 2007 10:36:57 -0400 Message-ID: <45F56589.1020209@garzik.org> References: <45F48809.2060908@emc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Ric Wheeler , linux-scsi , linux-fsdevel@vger.kernel.org, Linux-ide To: Jan Engelhardt Return-path: In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Jan Engelhardt wrote: > On Mar 11 2007 18:51, Ric Wheeler wrote: >> During the recent IO/FS workshop, we spoke briefly about the >> coming change to a 4k sector size for disks on linux. If I >> recall correctly, the general feeling was that the impact was >> not significant since we already do most file system IO in 4k >> page sizes and should be fine as long as we partition drives >> correctly and avoid non-4k aligned partitions. > > Sorry about jumping right in, but what about an 'old-style' > partition table that relies on 512 as a unit? For 1K/4K physical sector size, where logical sector size remains 512-b, nothing changes. DOS partitions start partitions on odd-numbered sectors, so presuming you have odd-aligned disks, life is good. For 1K/4K logical sector sizes, who knows. EFI? Certainly seems incompatible with the current popular DOS partition format. Jeff